Method and apparatus for performing panel based uplink timing alignment in wireless communication system

Abstract

The present disclosure relates to a method of performing operations for a User Equipment (UE) in a wireless communication system. In particular, the method includes receiving information on a first time Alignment Timer (TAT) associated with a first Timing Advance Group (TAG) and a second TAT associated with a second TAG, wherein a first panel related to the first TAG and a second panel related to the second TAG belong to a same serving cell; receiving at least one downlink control information (DCI) for uplink transmission; and performing the uplink transmission based on the at least one DCI, wherein, based on the first TAT not being running and the second TAT being running, the uplink transmission is performed on both at least one of the first panel and the second panel.

1 . A method for performing operations for a User Equipment (UE) in a wireless communication system, the method comprising:
 receiving information on a first time Alignment Timer (TAT) associated with a first Timing Advance Group (TAG) and a second TAT associated with a second TAG, wherein a first panel related to the first TAG and a second panel related to the second TAG belong to a same serving cell;   receiving at least one downlink control information (DCI) for uplink transmission; and   performing the uplink transmission based on the at least one DCI,   wherein, based on the first TAT not being running and the second TAT being running, the uplink transmission is performed on at least one of the first panel and the second panel.   
     
     
         2 . The method of  claim 1 , wherein, based on the first TAT not being running and the second TAT being running, the uplink transmission is performed based on the at least one DCI comprising a single-DCI for both the first panel and the second panel. 
     
     
         3 . The method of  claim 1 , wherein:
 based on the first TAT not being running and the second TAT being running and based on the at least one DCI comprising first DCI for the first panel, the uplink transmission is not performed.   based on the first TAT not being running and the second TAT being running and based on the at least one DCI comprising second DCI for the second panel, the uplink transmission is performed on the second panel.   
     
     
         4 . The method of  claim 1 , wherein the first panel related to the first TAG is indicated by a first sounding reference signal (SRS) resource set identifier, and the second panel related to the second TAG is indicated by a second SRS resource set identifier. 
     
     
         5 . The method of  claim 1 , wherein:
 based on the first TAT associated with the first TAG being running, a first uplink resource related to the first TAG included in the at least one DCI is considered as valid,   based on the second TAT associated with the second TAG being running, a second uplink resource related to the second TAG included in the at least one DCI is considered as valid.   
     
     
         6 . A user equipment (UE) in a wireless communication system, the UE comprising:
 at least one transceiver;   at least one processor; and   at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:   receiving information on a first time Alignment Timer (TAT) associated with a first Timing Advance Group (TAG) and a second TAT associated with a second TAG, wherein a first panel related to the first TAG and a second panel related to the second TAG belong to a same serving cell;   receiving at least one downlink control information (DCI) for uplink transmission; and   performing the uplink transmission based on the at least one DCI,   wherein, based on the first TAT not being running and the second TAT being running, the uplink transmission is performed on at least one of the first panel and the second panel.   
     
     
         7 . The UE of  claim 6 , wherein, based on the first TAT not being running and the second TAT being running, the uplink transmission is performed based on the at least one DCI comprising a single-DCI for both the first panel and the second panel. 
     
     
         8 . The UE of  claim 6 , wherein:
 based on the first TAT not being running and the second TAT being running and based on the at least one DCI comprising first DCI for the first panel, the uplink transmission is not performed.   based on the first TAT not being running and the second TAT being running and based on the at least one DCI comprising second DCI for the second panel, the uplink transmission is performed on the second panel.   
     
     
         9 . The UE of  claim 6 , wherein the first panel related to the first TAG is indicated by a first sounding reference signal (SRS) resource set identifier, and the second panel related to the second TAG is indicated by a second SRS resource set identifier. 
     
     
         10 . The UE of  claim 6 , wherein:
 based on the first TAT associated with the first TAG being running, a first uplink resource related to the first TAG included in the at least one DCI is considered as valid,   based on the second TAT associated with the second TAG being running, a second uplink resource related to the second TAG included in the at least one DCI is considered as valid.   
     
     
         11 . An apparatus for a user equipment (UE), the apparatus comprising:
 at least one processor; and   at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:   receiving information on a first time Alignment Timer (TAT) associated with a first Timing Advance Group (TAG) and a second TAT associated with a second TAG, wherein a first panel related to the first TAG and a second panel related to the second TAG belong to a same serving cell;   receiving at least one downlink control information (DCI) for uplink transmission; and   performing the uplink transmission based on the at least one DCI,   wherein, based on the first TAT not being running and the second TAT being running, the uplink transmission is performed on at least one of the first panel and the second panel.   
     
     
         12 . A non-transitory computer readable storage medium storing at least one computer program comprising instructions that, when executed by at least one processor, cause the at least one processor to perform operations for a user equipment (UE), the operations comprising:
 receiving information on a first time Alignment Timer (TAT) associated with a first Timing Advance Group (TAG) and a second TAT associated with a second TAG, wherein a first panel related to the first TAG and a second panel related to the second TAG belong to a same serving cell;   receiving at least one downlink control information (DCI) for uplink transmission; and   performing the uplink transmission based on the at least one DCI,   wherein, based on the first TAT not being running and the second TAT being running, the uplink transmission is performed on at least one of the first panel and the second panel.